JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
A rod of length \(10\) cm lies along the principle axis of a concave mirror of focal length \(10\) cm as shown in figure. The length of the image is _____ cm.
- A \(2.5\)
- B \(5\)
- C \(7.5\)
- D \(7\)
Answer & Solution
Correct Answer
(B) \(5\)
Step-by-step Solution
Detailed explanation
For the given concave mirror, the focal length is \(f = -10\) cm. The rod lies along the principal axis. From the figure, the near end of the rod is at a distance of \(20\) cm from the pole of the mirror. Since the length of the rod is \(10\) cm, the far end is at a distance of…
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